GD 930 HEPA VacuumThis 4-gallon capacity canister vacuum is designed for big professional cleaning jobs and has a lightweight superior design with high power suction that makes it easier to handle and more efficient. With its filtration of 99.97% at 0.3 microns, the GD 930 HEPA meets federal standards and totally removes hazardous dust and dirt. For greater maneuverability, try an optional back-pack harness.